NFS-StorageGateway for Private hub shared filesystem?

I'm beginning to setup our two Private Automation Hubs in AWS, and when reading about using a 'shared filesystem' for HA benefits we would up deploying a StorageGateway using S3 with an NFS share.
Buth hubs can mount with RW access, however the setup.sh fails due to not being able to chown the mount at /var/lib/pulp.

Is using an external NFS share/export the way to go here? Or should I just go with sharing the pulp directory from on Hub, and mounting it on the other Hub?

Thanks!